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Case study · Bath

21kW in-roof solar
on a full re-roof.

44 LONGi mono black panels set into a brand-new roof rather than bolted on top of it, with a 12kW three-phase hybrid inverter and 17.4kWh of battery storage. Designed and installed by our own team in Bath.

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NICEIC registered
Installations to MCS standards
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The system

What we
installed.

System size
21.12kWp
Panels
44 × LONGi 480W
Mono black, 17 and 27 across two roof slopes
Mounting
GSE in-roof
Full re-roof, panels flush with the roofline
Inverter
SolaX X3 Hybrid G4 PRO 12kW
Three-phase hybrid
Battery
17.4kWh
Location
Bath
Before and after

From bare roof
to finished array.

Drone view of a Bath bungalow mid re-roof, with GSE in-roof solar panels going in on both slopes
DuringThe old roof stripped back, with the in-roof system going in on both slopes before the new tiles went on.
Finished 21kW in-roof solar installation on a re-roofed bungalow in Bath, with LONGi mono black panels flush with the new tiles
AfterNew roof finished, with the arrays sitting flush in the roofline rather than on rails above it.
The design

Why it was
built this way.

In-roof, because the roof was coming off anyway. On a full re-roof, in-roof is the obvious choice. The GSE trays replace the tiles they cover, so you aren't paying for roof covering under the panels, and the finished array sits flush with the new roofline instead of on rails above it.

Both slopes used. The 44 panels are split 17 and 27 across two slopes, which spreads generation across more of the day than a single-slope array.

Three-phase hybrid inverter. The property has a three-phase supply, so the system runs on SolaX's 12kW three-phase hybrid, which manages the panels and the battery from one unit.

17.4kWh of storage. A battery this size holds a large share of the daytime generation for use in the evening, and can also charge on a cheap overnight tariff.

Thinking about a re-roof? How in-roof solar works →

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Planning a re-roof
or in-roof solar?

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